colorful

I found this little guy in a parking lot.. its completely clear besides has inclusions in it, and at a certain angle you can see rainbow colors. Also looking at it from the top down it has 4 corners..when you put a light under it it illuminates immensely. Help me identify it.

Hello! I found this interesting rock in Northern Illinois, the area has been built on but tends to get quite muddy and turn up a lot of rocks. The surrounding area sports a lot of wetlands/glacial runs offs. My SO suggested it as an Agate but I couldn't find an example quite similar. Any ideas...

Hello, my dad has dig with excavator this stone 10 years ago in Italy, it was for a long time in house and i decide to find answer what really this stone is, i was searching like 10 hours but cant find anything similar? anyone have an idea what this is ?